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BPF: make __builtin_btf_type_id() return 64bit int
Linux kernel recently added support for kernel modules https://lore.kernel.org/bpf/20201110011932.3201430-5-andrii@kernel.org/ In such cases, a type id in the kernel needs to be presented as (btf id for modules, btf type id for this module). Change __builtin_btf_type_id() to return 64bit value so libbpf can do the above encoding. Differential Revision: https://reviews.llvm.org/D91489
This commit is contained in:
Yonghong Song
parent
0bc59c8f71
commit
4b2b975a37
@ -24,7 +24,7 @@ let TargetPrefix = "bpf" in { // All intrinsics start with "llvm.bpf."
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Intrinsic<[llvm_i32_ty], [llvm_anyptr_ty, llvm_i64_ty],
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[IntrNoMem, ImmArg<ArgIndex<1>>]>;
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def int_bpf_btf_type_id : GCCBuiltin<"__builtin_bpf_btf_type_id">,
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Intrinsic<[llvm_i32_ty], [llvm_i32_ty, llvm_i64_ty],
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Intrinsic<[llvm_i64_ty], [llvm_i32_ty, llvm_i64_ty],
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[IntrNoMem]>;
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def int_bpf_preserve_type_info : GCCBuiltin<"__builtin_bpf_preserve_type_info">,
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Intrinsic<[llvm_i32_ty], [llvm_i32_ty, llvm_i64_ty],
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@ -90,7 +90,7 @@ static bool BPFPreserveDITypeImpl(Function &F) {
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}
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BasicBlock *BB = Call->getParent();
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IntegerType *VarType = Type::getInt32Ty(BB->getContext());
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IntegerType *VarType = Type::getInt64Ty(BB->getContext());
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std::string GVName = BaseName + std::to_string(Count) + "$" +
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std::to_string(Reloc);
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GlobalVariable *GV = new GlobalVariable(
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@ -99,8 +99,8 @@ static bool BPFPreserveDITypeImpl(Function &F) {
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GV->setMetadata(LLVMContext::MD_preserve_access_index, MD);
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// Load the global variable which represents the type info.
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auto *LDInst = new LoadInst(Type::getInt32Ty(BB->getContext()), GV, "",
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Call);
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auto *LDInst =
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new LoadInst(Type::getInt64Ty(BB->getContext()), GV, "", Call);
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Instruction *PassThroughInst =
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BPFCoreSharedInfo::insertPassThrough(M, BB, LDInst, Call);
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Call->replaceAllUsesWith(PassThroughInst);
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@ -1224,7 +1224,9 @@ bool BTFDebug::InstLower(const MachineInstr *MI, MCInst &OutMI) {
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}
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if (Reloc == BPFCoreSharedInfo::ENUM_VALUE_EXISTENCE ||
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Reloc == BPFCoreSharedInfo::ENUM_VALUE)
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Reloc == BPFCoreSharedInfo::ENUM_VALUE ||
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Reloc == BPFCoreSharedInfo::BTF_TYPE_ID_LOCAL ||
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Reloc == BPFCoreSharedInfo::BTF_TYPE_ID_REMOTE)
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OutMI.setOpcode(BPF::LD_imm64);
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else
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OutMI.setOpcode(BPF::MOV_ri);
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@ -1,9 +1,9 @@
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; RUN: opt -O2 %s | llvm-dis > %t1
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; RUN: opt -O2 -mtriple=bpf-pc-linux %s | llvm-dis > %t1
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; RUN: llc -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK %s
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; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK %s
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;
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; Source code:
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; static int (*bpf_log)(unsigned tid, void *data, int data_size) = (void *)999;
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; static int (*bpf_log)(unsigned long tid, void *data, int data_size) = (void *)999;
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; struct {
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; char f1[100];
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; typeof(3) f2;
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@ -20,43 +20,45 @@
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; Compilation flag:
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; clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c
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target triple = "bpf"
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@tmp__abc = dso_local global { <{ i8, i8, [98 x i8] }>, i32 } { <{ i8, i8, [98 x i8] }> <{ i8 1, i8 3, [98 x i8] zeroinitializer }>, i32 0 }, align 4, !dbg !0
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@bpf_log = internal global i32 (i64, i8*, i32)* inttoptr (i64 999 to i32 (i64, i8*, i32)*), align 8, !dbg !17
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; Function Attrs: nounwind
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define dso_local void @prog1() local_unnamed_addr #0 !dbg !28 {
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define dso_local void @prog1() #0 !dbg !28 {
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entry:
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%0 = tail call i32 @llvm.bpf.btf.type.id(i32 0, i64 0), !dbg !31, !llvm.preserve.access.index !7
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%call = tail call i32 inttoptr (i64 999 to i32 (i32, i8*, i32)*)(i32 %0, i8* getelementptr inbounds ({ <{ i8, i8, [98 x i8] }>, i32 }, { <{ i8, i8, [98 x i8] }>, i32 }* @tmp__abc, i64 0, i32 0, i32 0), i32 104) #2, !dbg !32
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ret void, !dbg !33
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}
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; Function Attrs: nounwind readnone
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declare i32 @llvm.bpf.btf.type.id(i32, i64) #1
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; Function Attrs: nounwind
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define dso_local void @prog2() local_unnamed_addr #0 !dbg !34 {
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entry:
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%0 = tail call i32 @llvm.bpf.btf.type.id(i32 1, i64 0), !dbg !35, !llvm.preserve.access.index !6
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%call = tail call i32 inttoptr (i64 999 to i32 (i32, i8*, i32)*)(i32 %0, i8* getelementptr inbounds ({ <{ i8, i8, [98 x i8] }>, i32 }, { <{ i8, i8, [98 x i8] }>, i32 }* @tmp__abc, i64 0, i32 0, i32 0), i32 104) #2, !dbg !36
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%0 = load i32 (i64, i8*, i32)*, i32 (i64, i8*, i32)** @bpf_log, align 8, !dbg !31, !tbaa !32
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%1 = call i64 @llvm.bpf.btf.type.id(i32 0, i64 0), !dbg !36, !llvm.preserve.access.index !7
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%call = call i32 %0(i64 %1, i8* getelementptr inbounds ({ <{ i8, i8, [98 x i8] }>, i32 }, { <{ i8, i8, [98 x i8] }>, i32 }* @tmp__abc, i32 0, i32 0, i32 0), i32 104), !dbg !31
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ret void, !dbg !37
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}
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; Function Attrs: nounwind readnone
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declare i64 @llvm.bpf.btf.type.id(i32, i64) #1
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; Function Attrs: nounwind
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define dso_local void @prog3() local_unnamed_addr #0 !dbg !38 {
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define dso_local void @prog2() #0 !dbg !38 {
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entry:
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%0 = tail call i32 @llvm.bpf.btf.type.id(i32 2, i64 1), !dbg !39, !llvm.preserve.access.index !11
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%call = tail call i32 inttoptr (i64 999 to i32 (i32, i8*, i32)*)(i32 %0, i8* getelementptr inbounds ({ <{ i8, i8, [98 x i8] }>, i32 }, { <{ i8, i8, [98 x i8] }>, i32 }* @tmp__abc, i64 0, i32 0, i32 0), i32 104) #2, !dbg !40
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%0 = load i32 (i64, i8*, i32)*, i32 (i64, i8*, i32)** @bpf_log, align 8, !dbg !39, !tbaa !32
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%1 = call i64 @llvm.bpf.btf.type.id(i32 1, i64 0), !dbg !40, !llvm.preserve.access.index !6
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%call = call i32 %0(i64 %1, i8* getelementptr inbounds ({ <{ i8, i8, [98 x i8] }>, i32 }, { <{ i8, i8, [98 x i8] }>, i32 }* @tmp__abc, i32 0, i32 0, i32 0), i32 104), !dbg !39
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ret void, !dbg !41
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}
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; Function Attrs: nounwind
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define dso_local void @prog3() #0 !dbg !42 {
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entry:
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%0 = load i32 (i64, i8*, i32)*, i32 (i64, i8*, i32)** @bpf_log, align 8, !dbg !43, !tbaa !32
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%1 = call i64 @llvm.bpf.btf.type.id(i32 2, i64 1), !dbg !44, !llvm.preserve.access.index !11
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%call = call i32 %0(i64 %1, i8* getelementptr inbounds ({ <{ i8, i8, [98 x i8] }>, i32 }, { <{ i8, i8, [98 x i8] }>, i32 }* @tmp__abc, i32 0, i32 0, i32 0), i32 104), !dbg !43
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ret void, !dbg !45
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}
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; CHECK-LABEL: prog1
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; CHECK: r1 = 3
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; CHECK: r1 = 3 ll
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; CHECK-LABEL: prog2
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; CHECK: r1 = 10
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; CHECK: r1 = 10 ll
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; CHECK-LABEL: prog3
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; CHECK: r1 = 4
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; CHECK: r1 = 4 ll
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; CHECK: .long 0 # BTF_KIND_STRUCT(id = 3)
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; CHECK-NEXT: .long 67108866 # 0x4000002
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@ -94,9 +96,8 @@ entry:
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; CHECK-NEXT: .long 48
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; CHECK-NEXT: .long 7
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attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #0 = { nounwind "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone }
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attributes #2 = { nounwind }
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!24, !25, !26}
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@ -104,7 +105,7 @@ attributes #2 = { nounwind }
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "tmp__abc", scope: !2, file: !3, line: 5, type: !7, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 12.0.0 (https://github.com/llvm/llvm-project.git f39aae11dca3f8f8c2c755a871726ed2fa82fd57)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, retainedTypes: !5, globals: !16, splitDebugInlining: false, nameTableKind: None)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 12.0.0 (https://github.com/llvm/llvm-project.git 630c2da0e967e27e2a4c678dfc6e452a74141880)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, retainedTypes: !5, globals: !16, splitDebugInlining: false, nameTableKind: None)
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!3 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core")
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!4 = !{}
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!5 = !{!6, !11}
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@ -124,23 +125,27 @@ attributes #2 = { nounwind }
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!19 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !20, size: 64)
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!20 = !DISubroutineType(types: !21)
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!21 = !{!15, !22, !23, !15}
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!22 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
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!22 = !DIBasicType(name: "long unsigned int", size: 64, encoding: DW_ATE_unsigned)
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!23 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
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!24 = !{i32 7, !"Dwarf Version", i32 4}
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!25 = !{i32 2, !"Debug Info Version", i32 3}
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!26 = !{i32 1, !"wchar_size", i32 4}
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!27 = !{!"clang version 12.0.0 (https://github.com/llvm/llvm-project.git f39aae11dca3f8f8c2c755a871726ed2fa82fd57)"}
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!27 = !{!"clang version 12.0.0 (https://github.com/llvm/llvm-project.git 630c2da0e967e27e2a4c678dfc6e452a74141880)"}
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!28 = distinct !DISubprogram(name: "prog1", scope: !3, file: !3, line: 6, type: !29, scopeLine: 6, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !4)
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!29 = !DISubroutineType(types: !30)
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!30 = !{null}
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!31 = !DILocation(line: 7, column: 11, scope: !28)
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!32 = !DILocation(line: 7, column: 3, scope: !28)
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!33 = !DILocation(line: 8, column: 1, scope: !28)
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!34 = distinct !DISubprogram(name: "prog2", scope: !3, file: !3, line: 9, type: !29, scopeLine: 9, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !4)
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!35 = !DILocation(line: 10, column: 11, scope: !34)
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!36 = !DILocation(line: 10, column: 3, scope: !34)
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!37 = !DILocation(line: 11, column: 1, scope: !34)
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!38 = distinct !DISubprogram(name: "prog3", scope: !3, file: !3, line: 12, type: !29, scopeLine: 12, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !4)
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!39 = !DILocation(line: 13, column: 11, scope: !38)
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!40 = !DILocation(line: 13, column: 3, scope: !38)
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!41 = !DILocation(line: 14, column: 1, scope: !38)
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!31 = !DILocation(line: 7, column: 3, scope: !28)
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!32 = !{!33, !33, i64 0}
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!33 = !{!"any pointer", !34, i64 0}
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!34 = !{!"omnipotent char", !35, i64 0}
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!35 = !{!"Simple C/C++ TBAA"}
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!36 = !DILocation(line: 7, column: 11, scope: !28)
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!37 = !DILocation(line: 8, column: 1, scope: !28)
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!38 = distinct !DISubprogram(name: "prog2", scope: !3, file: !3, line: 9, type: !29, scopeLine: 9, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !4)
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!39 = !DILocation(line: 10, column: 3, scope: !38)
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!40 = !DILocation(line: 10, column: 11, scope: !38)
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!41 = !DILocation(line: 11, column: 1, scope: !38)
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!42 = distinct !DISubprogram(name: "prog3", scope: !3, file: !3, line: 12, type: !29, scopeLine: 12, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !4)
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!43 = !DILocation(line: 13, column: 3, scope: !42)
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!44 = !DILocation(line: 13, column: 11, scope: !42)
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!45 = !DILocation(line: 14, column: 1, scope: !42)
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@ -18,15 +18,16 @@ entry:
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%arg.addr = alloca %struct.s1*, align 8
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store %struct.s1* %arg, %struct.s1** %arg.addr, align 8, !tbaa !18
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call void @llvm.dbg.declare(metadata %struct.s1** %arg.addr, metadata !17, metadata !DIExpression()), !dbg !22
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%0 = call i32 @llvm.bpf.btf.type.id(i32 0, i64 0), !dbg !23, !llvm.preserve.access.index !12
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ret i32 %0, !dbg !24
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%0 = call i64 @llvm.bpf.btf.type.id(i32 0, i64 0), !dbg !23, !llvm.preserve.access.index !12
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%conv = trunc i64 %0 to i32, !dbg !23
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ret i32 %conv, !dbg !24
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}
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; Function Attrs: nounwind readnone speculatable willreturn
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; Function Attrs: nofree nosync nounwind readnone speculatable willreturn
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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; Function Attrs: nounwind readnone
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declare i32 @llvm.bpf.btf.type.id(i32, i64) #2
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declare i64 @llvm.bpf.btf.type.id(i32, i64) #2
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; Function Attrs: nounwind
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define dso_local i32 @bar(%struct.s1* %arg) #0 !dbg !25 {
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@ -34,8 +35,9 @@ entry:
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%arg.addr = alloca %struct.s1*, align 8
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store %struct.s1* %arg, %struct.s1** %arg.addr, align 8, !tbaa !18
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call void @llvm.dbg.declare(metadata %struct.s1** %arg.addr, metadata !27, metadata !DIExpression()), !dbg !28
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%0 = call i32 @llvm.bpf.btf.type.id(i32 1, i64 0), !dbg !29, !llvm.preserve.access.index !12
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ret i32 %0, !dbg !30
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%0 = call i64 @llvm.bpf.btf.type.id(i32 1, i64 0), !dbg !29, !llvm.preserve.access.index !12
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%conv = trunc i64 %0 to i32, !dbg !29
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ret i32 %conv, !dbg !30
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}
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; CHECK: .long 1 # BTF_KIND_STRUCT(id = 2)
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@ -57,20 +59,20 @@ entry:
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; CHECK-NEXT: .long 6
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attributes #0 = { nounwind "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone speculatable willreturn }
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attributes #1 = { nofree nosync nounwind readnone speculatable willreturn }
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attributes #2 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 12.0.0 (https://github.com/llvm/llvm-project.git 80a3f7beebd8caab358ff063526ae2d26467c029)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 12.0.0 (https://github.com/llvm/llvm-project.git c1c153c3c70641a23c4a9540a897ff2d4eb4c5b2)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "test.c", directory: "/home/yhs/work/tests/dup")
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!2 = !{}
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!3 = !{i32 7, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 12.0.0 (https://github.com/llvm/llvm-project.git 80a3f7beebd8caab358ff063526ae2d26467c029)"}
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!6 = !{!"clang version 12.0.0 (https://github.com/llvm/llvm-project.git c1c153c3c70641a23c4a9540a897ff2d4eb4c5b2)"}
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!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 2, type: !8, scopeLine: 2, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !16)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10, !11}
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@ -12,14 +12,16 @@ target triple = "bpf"
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; Function Attrs: noinline nounwind optnone
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define dso_local i32 @foo() #0 !dbg !9 {
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entry:
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%0 = call i32 @llvm.bpf.btf.type.id(i32 0, i64 0), !dbg !12, !llvm.preserve.access.index !4
|
||||
%1 = call i32 @llvm.bpf.preserve.type.info(i32 1, i64 0), !dbg !13, !llvm.preserve.access.index !14
|
||||
%add = add i32 %0, %1, !dbg !17
|
||||
ret i32 %add, !dbg !18
|
||||
%0 = call i64 @llvm.bpf.btf.type.id(i32 0, i64 0), !dbg !11, !llvm.preserve.access.index !4
|
||||
%1 = call i32 @llvm.bpf.preserve.type.info(i32 1, i64 0), !dbg !12, !llvm.preserve.access.index !13
|
||||
%conv = zext i32 %1 to i64, !dbg !12
|
||||
%add = add i64 %0, %conv, !dbg !16
|
||||
%conv1 = trunc i64 %add to i32, !dbg !11
|
||||
ret i32 %conv1, !dbg !17
|
||||
}
|
||||
|
||||
; Function Attrs: nounwind readnone
|
||||
declare i32 @llvm.bpf.btf.type.id(i32, i64) #1
|
||||
declare i64 @llvm.bpf.btf.type.id(i32, i64) #1
|
||||
|
||||
; Function Attrs: nounwind readnone
|
||||
declare i32 @llvm.bpf.preserve.type.info(i32, i64) #1
|
||||
@ -40,13 +42,12 @@ attributes #1 = { nounwind readnone }
|
||||
!6 = !{i32 2, !"Debug Info Version", i32 3}
|
||||
!7 = !{i32 1, !"wchar_size", i32 4}
|
||||
!8 = !{!"clang version 12.0.0"}
|
||||
!9 = distinct !DISubprogram(name: "foo", scope: !10, file: !10, line: 2, type: !11, scopeLine: 2, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
|
||||
!10 = !DIFile(filename: "C:/src/tmp/a.c", directory: "")
|
||||
!11 = !DISubroutineType(types: !3)
|
||||
!12 = !DILocation(line: 2, column: 21, scope: !9)
|
||||
!13 = !DILocation(line: 2, column: 51, scope: !9)
|
||||
!14 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "ss", file: !10, line: 1, size: 32, elements: !15)
|
||||
!15 = !{!16}
|
||||
!16 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !14, file: !10, line: 1, baseType: !4, size: 32)
|
||||
!17 = !DILocation(line: 2, column: 49, scope: !9)
|
||||
!18 = !DILocation(line: 2, column: 14, scope: !9)
|
||||
!9 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 2, type: !10, scopeLine: 2, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
|
||||
!10 = !DISubroutineType(types: !3)
|
||||
!11 = !DILocation(line: 2, column: 20, scope: !9)
|
||||
!12 = !DILocation(line: 2, column: 50, scope: !9)
|
||||
!13 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "ss", file: !1, line: 1, size: 32, elements: !14)
|
||||
!14 = !{!15}
|
||||
!15 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !13, file: !1, line: 1, baseType: !4, size: 32)
|
||||
!16 = !DILocation(line: 2, column: 48, scope: !9)
|
||||
!17 = !DILocation(line: 2, column: 13, scope: !9)
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user